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Rh/tizite :: Rh/tizite (n.) A variety of the mineral cyanite.

Tiger-eye :: Tiger-eye (n.) A siliceous stone of a yellow color and chatoyant luster, obtained in South Africa and much used for ornament. It is an altered form of the mineral crocidolite. See Crocidolite..

Embolite :: Embolite (n.) A mineral consisting of both the chloride and the bromide of silver.

Feldspath :: Feldspath (n.) A name given to a group of minerals, closely related in crystalline form, and all silicates of alumina with either potash, soda, lime, or, in one case, baryta. They occur in crystals and crystalline masses, vitreous in luster, and breaking rather easily in two directions at right angles to each other, or nearly so. The colors are usually white or nearly white, flesh-red, bluish, or greenish..

Massive :: Massive (a.) In mass; not necessarily without a crystalline structure, but having no regular form; as, a mineral occurs massive..

Tophus :: Tophus (n.) One of the mineral concretions about the joints, and in other situations, occurring chiefly in gouty persons. They consist usually of urate of sodium; when occurring in the internal organs they are also composed of phosphate of calcium..

Cologne Earth :: Cologne earth () An earth of a deep brown color, containing more vegetable than mineral matter; an earthy variety of lignite, or brown coal..

Ripidolite :: Ripidolite (n.) A translucent mineral of a green color and micaceous structure, belonging to the chlorite group; a hydrous silicate of alumina, magnesia, and iron; -- called also clinochlore..

Greenockite :: Greenockite (n.) Native cadmium sulphide, a mineral occurring in yellow hexagonal crystals, also as an earthy incrustation..

Mineralogies :: Mineralogies (pl. ) of Mineralog.

Molybdenite :: Molybdenite (n.) A mineral occurring in soft, lead-gray, foliated masses or scales, resembling graphite; sulphide of molybdenum..

Structure :: Structure (n.) Arrangement of parts, of organs, or of constituent particles, in a substance or body; as, the structure of a rock or a mineral; the structure of a sentence..

Pyrrhotite :: Pyrrhotite (n.) A bronze-colored mineral, of metallic luster. It is a sulphide of iron, and is remarkable for being attracted by the magnet. Called also magnetic pyrites..

Schiller :: Schiller (n.) The peculiar bronzelike luster observed in certain minerals, as hypersthene, schiller spar, etc. It is due to the presence of minute inclusions in parallel position, and is sometimes of secondary origin..

Bovey Coal :: Bovey coal () A kind of mineral coal, or brown lignite, burning with a weak flame, and generally a disagreeable odor; -- found at Bovey Tracey, Devonshire, England. It is of geological age of the oolite, and not of the true coal era..

Mine :: Mine (v. i.) A pit or excavation in the earth, from which metallic ores, precious stones, coal, or other mineral substances are taken by digging; -- distinguished from the pits from which stones for architectural purposes are taken, and which are called quarries..

Rhodonite :: Rhodonite (n.) Manganese spar, or silicate of manganese, a mineral occuring crystallised and in rose-red masses. It is often used as an ornamental stone..

Glaucophane :: Glaucophane (n.) A mineral of a dark bluish color, related to amphibole. It is characteristic of certain crystalline rocks..

Strontium :: Strontium (n.) A metallic element of the calcium group, always naturally occurring combined, as in the minerals strontianite, celestite, etc. It is isolated as a yellowish metal, somewhat malleable but harder than calcium. It is chiefly employed (as in the nitrate) to color pyrotechnic flames red. Symbol Sr. Atomic weight 87.3..

Bismuth :: Bismuth (n.) One of the elements; a metal of a reddish white color, crystallizing in rhombohedrons. It is somewhat harder than lead, and rather brittle; masses show broad cleavage surfaces when broken across. It melts at 507¡ Fahr., being easily fused in the flame of a candle. It is found in a native state, and as a constituent of some minerals. Specific gravity 9.8. Atomic weight 207.5. Symbol Bi..

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